The term 'OWNER'S DOCUMENT' can refer to three different documents: a TITLE, DEED, and BILLOFSALE. A TITLE is a legal document that proves ownership of property or assets. A DEED is a legal document that transfers ownership of property from one person to another. A BILLOFSALE is a legal document that transfers ownership of personal property from one person to another. All three documents are important for establishing ownership of property or assets.